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"The Historical Geography of Iowa Fences", Christian L. Jung, January 1967
21. Research material for Land Fencing: "The Historical Geography of Iowa Fences", cont.
22. Research material for Land Fencing: "The Historical Geography of Iowa Fences", cont.
23. Research material for Land Fencing: "The Historical Geography of Iowa Fences", cont.
24. Research material for Land Fencing:
"The Fence in the Cultural Landscape", H. F. Raup, January 1947
"Fences and Farms", Eugene Cotton Mather, 1954
"Building in Wood in the Eastern United States", Fred Kniffen, 1966
25. Research material for Ozarks:
"Ozark Grapes Graduate into Big Business", January 1947
"Springdale Shows Steady Progress in Building and Marketing in 1946"
"A Friendly Little Journey Through a Portion of the Ozarks", V. Heber Sergeant, M.D, July 1935
26. Research material for Prairies:
"The Wonderful Prairie Sod", J. E. Weaver, July 1963
"Return of Midwestern Grassland to its Former Composition and Stabilization", J.E. Weaver, May 23, 1961
"North American Prairie", J. E. Weaver
"Extent of Communities and Abundance of the Most Common Grasses in Prairie", J.E. Weaver, 1960
"Reduction of Ungrazed Mixed Prairie to Short Grass as a Result of Drought and Dust", F. W. Albertson, 1946
"History of the Native Vegetation of Western Kansas During Seven Years of Continuous Drought", F. W. Albertson, 1942
"Competition of Western Wheat Grass With Relict Vegetation of Prairie", J. E. Weaver, 1942